Question
The following source code file - DetailedClockPaneTest.java - is a solution for JAVA_HA14.0: The DetailedClockPane Class. import java.util.Calendar; import java.util.GregorianCalendar; import javafx.application.Application; import javafx.geometry.Pos; import
The following source code file -
DetailedClockPaneTest.java
- is a solution for
JAVA_HA14.0: The DetailedClockPane Class.
import
java.util.Calendar;
import
java.util.GregorianCalendar;
import
javafx.application.Application;
import
javafx.geometry.Pos;
import
javafx.stage.Stage;
import
javafx.scene.Scene;
import
javafx.scene.control.Label;
import
javafx.scene.layout.BorderPane;
import
javafx.scene.layout.Pane;
import
javafx.scene.paint.Color;
import
javafx.scene.shape.Circle;
import
javafx.scene.shape.Line;
import
javafx.scene.text.Text;
public
class
DetailedClockPaneTest
extends
Application {
@Override
// Override the start method in the Application class
public
void
start(Stage primaryStage) {
// Create a clock and a label
DetailedClockPane clock =
new
DetailedClockPane();
String timeString = clock.getHour() + ":" + clock.getMinute() + ":" + clock.getSecond();
Label lblCurrentTime =
new
Label(timeString);
// Place clock and label in border pane
BorderPane pane =
new
BorderPane();
pane.setCenter(clock);
pane.setBottom(lblCurrentTime);
BorderPane.
setAlignment
(lblCurrentTime, Pos.
TOP_CENTER
);
// Create a scene and place it in the stage
Scene scene =
new
Scene(pane, 250, 250);
primaryStage.setTitle("DetailedClockPaneTest"); // Set the stage title
primaryStage.setScene(scene); // Place the scene in the stage
primaryStage.show(); // Display the stage
}
/**
* The main method is only needed for the IDE with limited JavaFX support.
* Not needed for running from the command line.
*/
public
static
void
main(String[] args) {
Application.
launch
(args);
}
class
DetailedClockPane
extends
Pane {
private
int
hour;
private
int
minute;
private
int
second;
// Clock pane's width and height
private
double
w = 250, h = 250;
/** Construct a default clock with the current time */
public
DetailedClockPane() {
setCurrentTime();
}
/** Construct a clock with specified hour, minute, and second */
public
DetailedClockPane(
int
hour,
int
minute,
int
second) {
this
.hour = hour;
this
.minute = minute;
this
.second = second;
paintClock();
}
/** Return hour */
public
int
getHour() {
return
hour;
}
/** Set a new hour */
public
void
setHour(
int
hour) {
this
.hour = hour;
paintClock();
}
/** Return minute */
public
int
getMinute() {
return
minute;
}
/** Set a new minute */
public
void
setMinute(
int
minute) {
this
.minute = minute;
paintClock();
}
/** Return second */
public
int
getSecond() {
return
second;
}
/** Set a new second */
public
void
setSecond(
int
second) {
this
.second = second;
paintClock();
}
/** Return clock pane's width */
public
double
getW() {
return
w;
}
/** Set clock pane's width */
public
void
setW(
double
w) {
this
.w = w;
paintClock();
}
/** Return clock pane's height */
public
double
getH() {
return
h;
}
/** Set clock pane's height */
public
void
setH(
double
h) {
this
.h = h;
paintClock();
}
/* Set the current time for the clock */
public
void
setCurrentTime() {
// Construct a calendar for the current date and time
Calendar calendar =
new
GregorianCalendar();
// Set current hour, minute and second
this
.hour = calendar.get(Calendar.
HOUR_OF_DAY
);
this
.minute = calendar.get(Calendar.
MINUTE
);
this
.second = calendar.get(Calendar.
SECOND
);
paintClock(); // Repaint the clock
}
/** Paint the clock */
private
void
paintClock() {
// Initialize clock parameters
double
clockRadius = Math.
min
(w, h) * 0.8 * 0.5;
double
centerX = w / 2;
double
centerY = h / 2;
// Draw circle
Circle circle =
new
Circle(centerX, centerY, clockRadius);
circle.setFill(Color.
WHITE
);
circle.setStroke(Color.
BLACK
);
// Draw second hand
double
sLength = clockRadius * 0.8;
double
secondX = centerX + sLength * Math.
sin
(second * (2 * Math.
PI
/ 60));
double
secondY = centerY - sLength * Math.
cos
(second * (2 * Math.
PI
/ 60));
Line sLine =
new
Line(centerX, centerY, secondX, secondY);
sLine.setStroke(Color.
RED
);
// Draw minute hand
double
mLength = clockRadius * 0.65;
double
xMinute = centerX + mLength * Math.
sin
(minute * (2 * Math.
PI
/ 60));
double
minuteY = centerY - mLength * Math.
cos
(minute * (2 * Math.
PI
/ 60));
Line mLine =
new
Line(centerX, centerY, xMinute, minuteY);
mLine.setStroke(Color.
BLUE
);
// Draw hour hand
double
hLength = clockRadius * 0.5;
double
hourX = centerX + hLength * Math.
sin
((hour % 12 + minute / 60.0) * (2 * Math.
PI
/ 12));
double
hourY = centerY - hLength * Math.
cos
((hour % 12 + minute / 60.0) * (2 * Math.
PI
/ 12));
Line hLine =
new
Line(centerX, centerY, hourX, hourY);
hLine.setStroke(Color.
GREEN
);
getChildren().clear();
getChildren().addAll(circle, sLine, mLine, hLine);
// Display more details on the clock
for
(
double
i = 0; i
double
percent;
if
(i % 5 == 0) {
percent = 0.9;
}
else
{
percent = 0.95;
}
double
xOuter = centerX + clockRadius * Math.
sin
(i * (2 * Math.
PI
/ 60));
double
yOuter = centerY - clockRadius * Math.
cos
(i * (2 * Math.
PI
/ 60));
double
xInner = centerX + percent * clockRadius * Math.
sin
(i * (2 * Math.
PI
/ 60));
double
yInner = centerY - percent * clockRadius * Math.
cos
(i * (2 * Math.
PI
/ 60));
getChildren().add(
new
Line(xOuter, yOuter, xInner, yInner));
}
// Display hours on the clock
for
(
int
i = 0; i
double
x = centerX + 0.8 * clockRadius * Math.
sin
(i * (2 * Math.
PI
/ 12));
double
y = centerY - 0.8 * clockRadius * Math.
cos
(i * (2 * Math.
PI
/ 12));
Text text =
new
Text(x - 4, y + 4, "" + ((i == 0) ? 12 : i));
getChildren().add(text);
}
}
}
}
If you run the above code, it will generate a clock as follows:
Create a ControlAClock class (
ControlAClock.java
) by modifying the above
DetailedClockPaneTest class to add the animation into this class so that the clock will
tick second-by-second. The modified program lets the user control the clock with the
Start
and
Stop
buttons, as shown as follows:
Note that the label of current time is removed and the clock will resize with the pane.
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